linux-kernel - Re: [PATCH] dax, pmem: add support for msync

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Date:	Thu, 3 Sep 2015 10:44:53 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Boaz Harrosh <boaz@...xistor.com>
Cc:	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Christoph Hellwig <hch@....de>,
	Dave Chinner <david@...morbit.com>,
	Andrew Morton <akpm@...l.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	linux-nvdimm@...ts.01.org, Peter Zijlstra <peterz@...radead.org>,
	x86@...nel.org, Hugh Dickins <hughd@...gle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>, linux-fsdevel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH] dax, pmem: add support for msync

On Thu, Sep 03, 2015 at 09:32:02AM +0300, Boaz Harrosh wrote:
> On 09/02/2015 10:04 PM, Ross Zwisler wrote:
> > On Tue, Sep 01, 2015 at 03:18:41PM +0300, Boaz Harrosh wrote:
> <>
> >> Apps expect all these to work:
> >> 1. open mmap m-write msync ... close
> >> 2. open mmap m-write fsync ... close
> >> 3. open mmap m-write unmap ... fsync close
> >>
> >> 4. open mmap m-write sync ...
> > 
> > So basically you made close have an implicit fsync?  What about the flow that
> > looks like this:
> > 
> > 5. open mmap close m-write
> > 
> 
> What? no, close means ummap because you need a file* attached to your vma
> 
> And you miss-understood me, the vm_opts->close is the *unmap* operation not
> the file::close() operation.
> 
> I meant memory-cl_flush on unmap before the vma goes away.

Ah, got it, thanks for the clarification.
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